George c



"ma Model.)

' G. G. BAI1.1.1531).`

INGANDESGBNT BLEGTRIG LAMP.

PatentedlAplnlZ, 1892.

'a-y?? wall/ging @2go @Hmm @d1/'wesen UNITED STATES PATENT OFFICE-GEORGE o. RAILLAR'D, OE NEw YORK, N. Y.A

INCANDESCENT ELECTRIC LAM P.

SPECIFICATION forming part of Letters VPatent No. 472,801, dated April12, 1892.

Application tiled September 22,1891. Serial No. 406,440. (No model.)

.To a/ZZ whom it may concern:

Be it known that I, GEORGE C. BAILLARD, a citizen of the United States,residing in New York city, State of New York, haveinventedv that both ofthe circuit-wires may readily be..

simultaneously coupled or connected with the filament-terminals in amanner to give a good and permanent electrical connection anddisconnected therefrom with equal facility.

The invention further relates to an improved construction of lamp-key,as hereinafter set forth in detail.

In the accompanying drawings, Figure l is a longitudinal central sectionshowing my improved lamp, as well as the manner of supporting the shadeand attaching the lamp to the fixture. Fig. 2 is a plan view on the line2 2, showing a means whereby the circuitwire terminals may be coupledwith the termirals of the filament. Fig. 3 is a similar view, the endsof the circuit-wire being indicated therein. Figs. 4 and V5 are detailviews of the key-switch and contacts, with theI operating-key orthumb-piece removed.

The sealed glass-bulb A is secured in the ordinary manner in adepression or socket in abase B of any suitable insulating material. Cindicates the carbon or other filament, the terminal wires c of whichare carried through the sealed bulb and each electrically connected witha tubular terminal c', embedded in the face of the base B. The base isscrew-threaded upon the exterior, and is adapted to receive acorrespondingly-threaded cap E, having therein two curved slots e, theinner projecting wall e of which cover the tubular terminals c when thecap is screwed down. rlhe cap being screwed down, a reverse partial turnexposes the tubular terminals c', they then being seen, as in Fig. 2, at

or near the ends of the curved slots. If not, the ends CZ of thecircuit-wires are each inserted in one of the tubular terminals and thecap or clamping deviceE is again screwed up. The projecting interiorwalls ot the slots moving across the openings of.the terminals comeagainst and press the terminal wires laterally, clamping them againstthe sides or edges of the tubular terminals and between the under faceof the cap and the base, as in Fig. 3. To facilitate this operation, theunder faces of the projections eiare beveled, as

indicated atf, Fig. l, and also in Figs. 2 and 3- by the dotted lines.The cap being screwed down tightly, the wires are firmly clamped in andagainst the tubular terminals and are at Vthe same time securely heldaway from each other, and being protected by the cap or clamping devicethere is' no danger of their being short-circuited by the accidentalcontact of a tool or wire.

In Fig. l the terminal wil-escl are shown as passing down straightthrough the slots in the cap into the tubular terminals,"the turn orscrewing np of the clamp not having been completed. This has been donemerely for convenience of illustration.

In the drawings I have shown a loose cap X, resting upon the base of thelamp (the clamping device or cap `E forming part of the base asdistinguished from a socket) and through which the twisted circuit-wiresare passed; but this is merely for an ornamental iinish and may bedispensed with.

The key is constructed and arranged as t'ollows: One of the wires c,leading to one of the filament-terminals, is broken and the endsrespectively connected with metal contacts or brackets O, mountedopposite each other on the bottom of an annular recess turned or formedin the side of the base. One of kthe brackets carries a projectingcontact-piece or linger o, arranged adjacent to the wall of the recess,and the other bracket carriesa projecting contact-spring o', the end ofwhich overlaps the finger 0 and is bent to form a notch or depression o2in its inner face near its end. The direction of tension of the springholds it away from the contact-linger and the circuit between thefilamentand its terminal is therefore normally open. The bracket andfinger or spring are in the construction shown struck up from one piece'of sheet metal. A switch or key lever P is pivoted centrally in therecess in the base. Its longer end p plays between limiting stop-pins pand its opposite ends p2 work against the contact-spring 0,. Theswitch-lever is moved in one direction or the other by pins s sprojecting from the inner face of' a button or thumb piece S, fitting inthe recess and turning upon vthe same screw-bolt S on which the lever ispivoted. In Fig. 4 the switch or key is open and the end 102 of thelever is engaged by the notch or depression o2 in the contact-spring.

In Fig. 5 the circuit is closed, the lever havT ing been turned so. thatits end has forced the spring outwardly into contact With the finger o,in Which position the parts are maintained by the pressure of the springon the lever.

The lamp shade or reflector maybe supported as follows: A ring G, ofmetal or other suitable material, is secured peripherally around the capE and has depending springarms g (three being shown) bent or hooked atthe ends to engage the flange g of any ordinary shade G'.

To secure the lamp to a bracket or chandelier-fixture, I provide ascrew-threaded collar I-I, adapted to screw upon the tube of the iixturethrough which the Wires emerge and having downwardly-projecting arms orclips h (three being indicated) that snap into recesses or anannulargroove hin the cap E.

I claim as my invention- 1. An incandescentlamp having in its basetubular filamentterminals, the slotted clamping plate or cap movabletransversely across said terminals to cover or expose them for theinsertion of the ends of the circuit-wires, whereby the ends of thewires may be clamped Yin the terminals by lateral strain, and a key inthe side of the base, substantially as and for the purpose set forth.

2. The combination of thel bulb and filament, the lamp-base in which thebulb is seated, the filament-terminals on the base, a recess in the sideof the base, the contactfinger and contact-spring located in said recessand interposed in the wire connecting the filament and one of itsterminals, the pivoted switch-lever operating upon said spring, and thelever-operating button seated in the recess in the side of the base.

3. In an incandescent lamp, the 'combina-y tion of the base having therecess in its side, the brackets O, the contact-linger, and theoverlapping contact-spring arranged within the recess W, theswitch-lever pivoted i-n the recess, and one end of which works againstthe contact-spring and the other between limiting-stops., the buttonitting in the recess, the pins on its inner face for operating thelever, and the screw-bolt screwed into the'base and on which the leverand but-ton turn.

In testimony whereof I have hereunto subscribed my name.

GEORGE C. BAILLARD.

Witnesses:

FRANK S. ODER, EDWARD C. DAVIDSON.

